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Related Experiment Video

Updated: Jun 23, 2026

Establishment of a Murine Pulp Exposure Model with a Novel Mouth-Gag for Pulpitis Research

Establishment of a Murine Pulp Exposure Model with a Novel Mouth-Gag for Pulpitis Research

Published on: October 27, 2023

A novel instrument to determine pulp proximity.

David G Purton¹, Nicholas P Chandler, Brian D Monteith

¹david.purton@dent.otago.ac.nz

The European Journal of Prosthodontics and Restorative Dentistry

|April 22, 2009

Summary

The Prepometer instrument accurately predicts pulp proximity in extracted teeth, with its red light indicating a dentine thickness of 2.4 mm. This dental tool shows higher sensitivity than initially specified.

Related Experiment Videos

Last Updated: Jun 23, 2026

Establishment of a Murine Pulp Exposure Model with a Novel Mouth-Gag for Pulpitis Research

Establishment of a Murine Pulp Exposure Model with a Novel Mouth-Gag for Pulpitis Research

Published on: October 27, 2023

Area of Science:

Dental materials science
Biomedical instrumentation

Background:

Assessing pulp proximity is crucial in dental procedures to prevent iatrogenic damage.
Existing methods for determining dentine thickness and pulp proximity can be invasive or lack precision.

Purpose of the Study:

To evaluate the efficacy of the Prepometer instrument in assessing pulp proximity using extracted human teeth.
To establish a correlation between Prepometer readings and actual dentine thickness.

Main Methods:

Extracted third molars were prepared, and Prepometer readings were taken.
Dentine was incrementally removed in 0.5 mm steps, with readings recorded until the red light indicator was activated.
Teeth were sectioned, and dentine thickness was measured to validate Prepometer data.

Main Results:

A highly significant predictor model (p < 0.01) was developed, correlating Prepometer readings with dentine thickness.
The boundary between amber and red light on the Prepometer corresponded to a dentine thickness of 2.4 mm.
The instrument demonstrated consistent and superior sensitivity in predicting pulp proximity compared to its specifications.

Conclusions:

Extracted teeth are a viable model for testing the Prepometer instrument.
The Prepometer provides a reliable and sensitive method for indicating pulp proximity during dental procedures.
The established 2.4 mm dentine thickness threshold for the red light offers a valuable quantitative measure.